from threading import Thread,Event
def aa():
    for i in range(1,53,2):

#SUO
        print(i+1)
        s.set()
        k.wait()
def bb():
    for j in range(65,91):
        s.wait()
        print(chr(j))
        s.clear()
        k.set()
k=Event()
s=Event()
a=Thread(target=aa)
b=Thread(target=bb)
a.start()
b.start()
